CopyStepDetails  
    class CopyStepDetails
Each step type has its own StepDetails structure.
Types
Properties
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                  Specifies the location for the file being copied. Use ${Transfer:UserName} or ${Transfer:UploadDate} in this field to parametrize the destination prefix by username or uploaded date.
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                  A flag that indicates whether to overwrite an existing file of the same name. The default is FALSE.
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                  Specifies which file to use as input to the workflow step: either the output from the previous step, or the originally uploaded file for the workflow.